Fig. 3From: Determining post-treatment surveillance criteria for predicting the elimination of Schistosoma mansoni transmissionPrevalence threshold value and positive predictive values (PPV) for treatment programmes with low (13%), moderate (45–60%) and high (91%) likelihoods of achieving elimination. Values are shown for surveillance occurring 2 years post-treatment with a sample size of 200 individuals (population size is set at 500)Back to article page